Download SUB-CUB-R - Red Lion Controls

BULLETIN NO. SCUBR-A
DRAWING NO. LP0178
REVISED 3/97
RED LION CONTROLS
INTERNATIONAL HEADQUARTERS
EUROPEAN HEADQUARTERS
20 Willow Springs Circle, York, Pa. 17402, (717) 767-6511 FAX: (717) 764-0839
Web site- http://www.redlion-controls.com
E-mail- [email protected]
892 Plymouth Road, Slough, Berkshire SL1 4LP
ENGLAND +44 1753 696888 FAX: +44 1753 696339
SUB-CUB-R - COMPLETE 6-DIGIT COMPONENT RATE INDICATOR/FREQUENCY METER
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LSI COUNTER CHIP WITH TIME BASE CHIP AND 0.35” (9 mm)
HIGH LCD DISPLAY
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SNAP MOUNTS DIRECTLY ONTO P.C. BOARD
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SOLDERLESS, ELASTOMERIC INTERCONNECTS
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ULTRA LOW POWER, 25 µA AT 3 V (Typical)
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SELECTABLE TIME BASE FROM 3.9 MSEC TO 15.9 SEC
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FREQUENCY DOUBLING CAPABILITY
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SELECTABLE DECIMAL POINT POSITIONS
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MASTER RESET TO SYNCHRONIZE TIME BASE WITH
EXTERNAL FUNCTIONS
DESCRIPTION
rate or frequency is needed within a circuit enclosure for maintenance,
diagnostic, tune-up, or other data readout requirements. The SUB-CUB-R can
also be mounted with a convenient bezel kit to provide a very flexible and
economical panel instrument.
The SUB-CUB-R snap-mounts directly on to any 1/16” P.C. Board that has
been etched to provide a mating interconnect pattern with two mounting holes
and a polarizing “key” hole. Interconnections to the P.C. Board as well as
internal connections are made with elastomeric connectors that provide
corrosion-proof, gas-tight interface contacts for high reliability.
As a completely self-contained tachometer/display module, the SUB-CUB-R
can be treated as a component just like any other I.C. The module contains a
custom monolithic counter/driver chip, a custom time base chip, and a 6-digit
Liquid Crystal Display. The time base of the SUB-CUB-R is determined by the
logic level of the Time Base Inputs and is selectable from approx 0.0039 second
up to approximately 15.9 seconds in .0039 second increments. The SUB-CUBR also allows for the selection of a decimal point position. The Master Reset
input allows the user to synchronize the SUB-CUB-R time base with external
operations.
This module is ideal for internal “on board” applications where a readout of
MOUNTING & DIMENSIONS
DIMENSIONS
Snap in mounting on the P.C. Board is facilitated by two, split, lock-ramp
pins which engage mounting holes drilled in the P.C. Board. The silicone
rubber elastomeric connectors compress to accommodate P.C. Board thickness
variation of ±0.005”.
In Inches (mm)
P.C. BOARD LAYOUT
P.C. Board pads may be gold or tin-lead plated. Pad
surface must be flat without excessive tin-lead build-up.
(Layout view is from SUB-CUB-R mounting side of board.)
Pad area must be clean and free of contaminants so that
proper electrical contact can be made.
Note: All hole size tolerances ±0.003” (0.08 mm)
All other tolerances ±0.005” (0.13 mm)
1
BLOCK DIAGRAM
DEVICE CONNECTIONS
TB12 - CMOS *Pulsed Pull-up Latched input. When input is connected to
VSS, 8 seconds is added to the total time base period. When input is
connected to VDD or left open, no time is added to the total time base
period.
TB11 - CMOS *Pulsed Pull-up Latched input. Adds 4 seconds to the total
time base period when input is connected to VSS.
TB10 - CMOS *Pulsed Pull-up Latched input. Adds 2 seconds to the total
time base period when input is connected to VSS.
TB9 - CMOS *Pulsed Pull-up Latched input. Adds 1 second to the total time
base period when input is connected to VSS.
TB8 - CMOS *Pulsed Pull-up Latched input. Adds 1/2 second to the total
time base period when input is connected to VSS.
TB7 - CMOS *Pulsed Pull-up Latched input. Adds 1/4 second to the total
time base period when input is connected to VSS.
TB6 - CMOS *Pulsed Pull-up Latched input. Adds 1/8 second to the total
time base period when input is connected to VSS.
TB5 - CMOS *Pulsed Pull-up Latched input. Adds 1/16 second to the total
time base period when input is connected to VSS.
TB4 - CMOS *Pulsed Pull-up Latched input. Adds 1/32 second to the total
time base period when input is connected to VSS.
TB3 - CMOS *Pulsed Pull-up Latched input. Adds 1/64 second to the total
time base period when input is connected to VSS.
TB2 - CMOS *Pulsed Pull-up Latched input. Adds 1/128 second to the total
time base period when input is connected to VSS.
TB1 - CMOS *Pulsed Pull-up Latched input. Adds 1/256 second to the total
time base period when input is connected to VSS.
DPA - CMOS *Pulsed Pull-up Latched input. When used along with DPB,
selects the position of the decimal point.
DPB - CMOS *Pulsed Pull-up Latched input. When used along with DPA,
selects the position of the decimal point.
F.D. - CMOS *Pulsed Pull-up Latched input. When input is connected to VSS,
Frequency Doubling is disabled. When input is connected to VDD or left
open, Frequency Doubling is enabled.
M.R. - CMOS Internally Pulled-up input. When input is connected to VSS,
Master Reset will terminate the present time base period. When MR is
allowed to go high, the next time base period will begin. In normal use,
MR is connected to VDD or left open. Note that this is not a Pulsed Pullup Latched input.
SIG. - CMOS Schmidt trigger input. Counter chip increments on the falling
edge of the Signal input when F.D. is connected to VSS (disabled). Counter
chip increments on both rising and falling edges of the Signal input when
F.D. is connected to VDD or left open (enabled).
VDD - +2.5 to 6.0 VDC Supply
VSS - Common for D.C. Supply and Inputs.
* See section on “Pulsed Pull-Up Latched Inputs” for more information.
Note: For maximum noise immunity , connect all TB inputs to either VDD or
VSS, whichever is appropriate. Inputs left open may change states in some
noisey environments.
CAUTION
MAXIMUM RATINGS (VOLTAGE REF. TO VSS)
This device contains CMOS circuitry which requires special anti-static
handling to the same degree required by standard CMOS integrated circuits.
Units should be stored in the conductive packaging used to ship the devices.
Containers should be opened and units handled only on a conductive table
top by personnel wearing wrist-strap grounding equipment. These devices
have the same protection circuits as standard CMOS devices to prevent
damage to inputs due to nominal over-voltage.
RATING
SYMBOL
VALUE
UNIT
DC Supply Voltage
VDD
-0.5 to +6.5
VDC
Input Voltage, All Inputs
VI
-0.5 to (VDD +0.5)
VDC
o
Operating Temperature*
TA
-35 to +85
C
o
Storage Temperature
TSTG
-35 to +85
C
* Extended high and low temperature ranges available, consult factory.
ELECTRICAL CHARACTERISTICS VDD = 5 V ±10% UNLESS OTHERWISE SPECIFIED
SYMBOL
PARAMETER
MIN.
VDD
Supply Voltage
2.5
TYP.
MAX.
UNIT
6.0
VDC
IDD
Supply Current
55
µA
IDDQ
Supply Current
45
µA
VSIH
Input High Voltage
3.9
3.0
10 KHz signal, 1 second time base. All other inputs high.
1 second time base. All other inputs high.
VDC
Signal input only.
VSIL
Input Low Voltage
0.9
VDC
Signal input only.
VIH
Input High Voltage
2.2
VDC
All other inputs.
VIL
Input Low Voltage
2.1
VDC
All other inputs.
ISIL
Input Leakage
0.01
IIH
Input High Current (source)
fc
Signal Frequency
RPU
Pull Up Resistance
TACC
Time Base Accuracy
50
0.5
TEST CONDITION
0.1
µA
VDD > VIN > VSS Signal input only.
200
µA
All other inputs.
KW
All pull-up inputs.
%
All time ranges.
500
50
0.05
2
KHz
TIME BASE SELECTION
DECIMAL POINT SELECTION
The SUB-CUB-R has a time base selection range of approx. 3.9 msec to 15.9
seconds in 3.906 msec (1/256 second) increments. The minimum time base
setting is obtained by pulling only the TB1 input low while the maximum time
base is obtained by pulling all TB inputs low. Therefore, a specific time base
is achieved by adding the appropriate individual time base increments. The
time base increment total is computed according to the following formula:
The selection of the Decimal Point is accomplished by the DPA and DPB
inputs. The table below shows the logic states which should be used to obtain
the desired decimal point location. The SUB-CUB-R has leading zero
blanking. Note that a change in decimal point position will only occur at the
end of the present time base period.
TIME BASE INCREMENT
DR x DDP x 15,360
TOTAL (TBIT)
=
RPM x PPR
WHERE:
DR
DDP
RPM
PPR
=
=
=
=
Desired Reading
Display Decimal Point
Revolutions Per Minute
Pulses Per Revolution
DPB
DPA
D.P. LOCATION
Low
Low
High/Open
High/Open
Low
High/Open
Low
High/Open
Factory Test Mode Only
0
0.0
0.00
PULSED PULL-UP LATCHED INPUTS
DDP:
0
=
0.0
=
0.00 =
1
10
100
The Display Decimal Point (DDP) value is
determined by the desired decimal point
placement in the readout.
TIME BASE
INPUT
TIME BASE
INCREMENT
TIME BASE
INPUT
TIME BASE
INCREMENT
TB1
TB2
TB3
TB4
TB5
TB6
1
2
4
8
16
32
TB7
TB8
TB9
TB10
TB11
TB12
64
128
256
512
1024
2048
The Time base inputs, the Decimal Point inputs, and the Frequency
Doubling inputs are designed to be actuated by wired or switched
connection to Common or by switching an open collector of a transistor to
Common. A pull-up resistance is provided for all of these inputs. To keep
current consumption to a minimum, this input circuit has been designed to
latch the present state of the inputs, allowing the pull-up resistance to be
switched on and off, thus reducing current consumption. The following is
a description of the sequence of events for these inputs (Refer to the
drawing below):
At the end of a previous time base, a 30.5 µsec pulse is generated within
the time base chip which will cause Q1 to switch ON the input’s pull-up
resistance. During this time, if the input is being held low, the input will
provide a sourcing current pulse thru Q1. The level of the input (either low
or high) is sensed by the input’s Latching Circuit. When the pulse is
terminated, the Latching Circuit will hold the input at its present state.
If an input, which is presently in the high state, is pulled low, the
Latching Circuit will respond immediately and latch the input in the low
state. If an input is presently held in the low state, and is allowed to float,
the Latching Circuit cannot respond until the end of the time base; at which
time, the Pulsed Pull-up resistance will pull the input high. The Latching
Circuit will then latch the high state. A Master Reset (MR) will terminate
the present time base and allow new TB inputs to be latched.
EXAMPLE: Find the appropriate Time Base input settings for a desired
display reading with a fixed shaft speed.
DESIRED READING (DR)
= 250.0
REVOLUTIONS PER MINUTE (RPM) = 1250
PULSES PER REVOLUTION (PPR)
= 50
TBIT =
250.0 x 10 x 15,360
38,400,00
= 62,500 = 614.4
1250 x 50
TBIT = 614 (round off to the nearest whole number)
TIME BASE INPUT
REMAINDER NEEDED
TB10 (512)
TB7 (64)
TB6 (32)
TB3 (4)
TB2 (2)
614 - 512 = 102
102 - 64 = 38
38 - 32 = 6
6-4=2
2-2=0
.........
.........
.........
.........
.........
As shown above, Time base inputs TB10, TB7, TB6, TB3, TB2 are pulled
low to generate the desired time base. The actual time base in seconds is
calculated by dividing the TBIT Total by 256.
614/256 = 2.398 sec.
FREQUENCY DOUBLING
FD is the Frequency Doubling input. When it is in the high state or left open,
twice the number of input pulses are registered on the readout. This doubling
of the signal input rate allows the Time Base Increment Total (TBIT) to be
halved, thus allowing for a faster update time for a given display value. If this
input is in the low state, Frequency Doubling is disabled.
3
TYPICAL APPLICATIONS
FLOW RATE
The SUB-CUB-R, along with some signal conditioning circuitry, can
be used as a flow indicator to measure the flow of liquid. A flow gage
with a magnetic type output is used to sense the rotation of the impellor,
and its output is fed through an amplifier circuit to the SIG input. Since
the output of the flow gage is an A.C. voltage, diodes D1 and D2 are
used to clamp the output signal swing to within ±0.7 volts of the supply
voltage. Diode D3 is used to prevent the voltage from rising above 6.0
VDC to prevent damaging the SUB-CUB-R. The time base of the SUBCUB-R is set to 0.5 sec (TB8 is connected to VSS ). Frequency doubling
is enabled (FD is connected to VDD ). This will allow the meter to
produce the appearance of a 1 second time base which updates twice a
second. The time base of the SUB-CUB-R can be varied to produce
different time bases required for different fluids. A second position
decimal point is selected (DPA and DPB are connected to VDD ).
DISPLAY FOR SPEED OF SMALL PRINTING PRESS
To determine the proper TB input settings for both feet per minute and for
meters per minute, use the following formula.
The SUB-CUB-R can be used to indicate the speed of the web of a small
printing press in both tenths of feet per minute and in tenths of meters per
minute. When the press is running at its maximum rate, the web is turning at
a rate of 1800 RPM, and the press is running at 250 feet per minute (76.2
meters per minute). The drive control produces a signal of 60 pulses per
revolution of web. To align the registration marks in the set-up mode, the
press speed is only 25 feet per minute.
The controller for the press provides a logic pulse which corresponds to its
speed. This logic pulse is fed through a buffer to the Signal input of the SUBCUB-R. The time base is determined by the position of the Selector switch.
In the first position, the SUB-CUB-R display will read out in tenths of feet per
minute. In the second position, the display will be in tenths of meters. Note
that Frequency Doubling is used to reduce the update time of the SUB-CUBR. The first decimal point is turned on by the logic levels of DPA and DPB.
TIME BASE INCREMENT
TOTAL (TBIT)
=
DR x DDP x 15,360
RPM x PPR
For Feet Per Minute:
TBIT =
250.0 x 10 x 15,360
1800 x 60
= 355.6
= 177.8 ( ÷2 when using F.D.)
= 178 (rounded off to the nearest whole number)
TB8
TB6
TB5
TB2
.
.
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.
.
.
.
.
.
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.
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.
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.
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-
TBIT = 178
128
32
16
2
Needed
Needed
Needed
Needed
=
=
=
=
50
18
2
0
For Meters Per Minute:
TBIT =
76.20 x 10 x 15,360
1800 x 60
= 108.4
= 54.2 ( ÷2 when using F.D.)
= 54 (rounded off to the nearest whole number)
TB6
TB5
TB3
TB2
.
.
.
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.
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.
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.
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.
-
TBIT = 178
32
16
4
2
SUB-CUB-R PROTOTYPING BOARD (P/N DMOSCB04)
This board is a handy way of doing experimental and prototyping work with the SUB-CUB-R. It
easily plugs onto standard 0.1” spacing bread boards. This in turn, greatly simplifies bread board work.
SUB-CUB-R
PROTOTYPING
BOARD
P/N DMOSCB04
4
Needed
Needed
Needed
Needed
=
=
=
=
22
6
2
0
PANEL BEZEL KIT FOR THE SUB-CUB-R (P/N HWK60000)
This kit provides a convenient way to adapt the SUB-CUB-R for panel mounting. The kit includes
the black plastic bezel, the panel and internal window gaskets, P.C. Board, 12” ribbon cable and
mounting screws.
ASSEMBLY
DIMENSIONS & PANEL CUT-OUT “In inches (mm)
PANEL CUT-OUT FRONT VIEW
ORDERING INFORMATION
MODEL NO.
DESCRIPTION
PART NUMBER
SCUBR
HWK 6
SUB-CUB Rate Indicator Module
*Panel Bezel Kit with P.C. Board & Cable
*Prototype P.C. Board
* Does not include SUB-CUB-R Display/Rate Indicator Module.
Order SUB-CUB-R separately.
5
SCUBR200
HWK60000
DMOSCB04